Hide 'out of stock' products in Woocommerce

I found easier way, if anybody is still looking for hiding out of stock products in woocommerce, follow these easy steps without editing html !

1. Go to WooCommerce -> Settings
2. Go to Inventory
3. There's a checkbox that says something about our problem, however it goes in english :-) you'll find what you need
4. Save

that will only work if you are using the official woocommerce shortcodes , but if you creating a page with visual composer and using customized plugins or 3rd party plugins or shortcodes , the first step is to for the query that run from the loop then you modify it to something like this

$params = array(
        'posts_per_page' => 5,
        'post_type' => array('product', 'product_variation'),
        'meta_query' => array(
            array(
                'key' => '_stock_status',
                'value' => 'instock'
            )
        )
);

the most important part that you have to be sure of is

    'meta_query' => array(
        array(
            'key' => '_stock_status',
            'value' => 'instock'
        )
    )

You can try adding this to your theme's functions.php file:

add_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

function custom_pre_get_posts_query( $q ) {

if ( ! $q->is_main_query() ) return;
if ( ! $q->is_post_type_archive() ) return;
if ( ! is_admin() ) {


$q->set( 'meta_query', array(array(
    'key'       => '_stock_status',
    'value'     => 'outofstock',
    'compare'   => 'NOT IN'
)));

}

remove_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

}

I modified the code from this URL: http://www.wptaskforce.com/how-to-exclude-one-or-more-category-in-woocommerce-shop-page/

Saved here again just in case that site goes offline: (this code excludes certain product categories)

add_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

function custom_pre_get_posts_query( $q ) {

if ( ! $q->is_main_query() ) return;
if ( ! $q->is_post_type_archive() ) return;
if ( ! is_admin() ) {

$q->set( 'tax_query', array(array(
'taxonomy' => 'product_cat',
'field' => 'slug',
'terms' => array( 'PUT YOUR CATEGORY HERE' ), // Don't display products in the membership category on the shop page . For multiple category , separate it with comma.
'operator' => 'NOT IN'
)));

}



remove_action( 'pre_get_posts', 'custom_pre_get_posts_query' );

}

Note to self: Always read the changelog from developer.

Found the answer here: http://develop.woothemes.com/woocommerce/2014/02/solving-common-issues-after-updating-to-woocommerce-2-1/#category-counts-incorrect

In case the product counts for categories are showing a too high or too low number, after updating to WooCommerce 2.1 there is an easy workaround.

Go to the ‘Tools’ tab inside the WooCommerce > System Status of your WordPress administration panel. Here you first use the ‘Recount terms’ button and after that use the ‘Clear transients’ button. This will force the system to recount all the products the next time a category is loaded.

Update: Also remember that it is not enough to change stock quantity to 0. You must also set "Stock status" to "Out of stock". If not the product will be counted in the shop, even if there are no products in stock.